You can debug your service or pod from the DC/OS UI.
Service and Pod Health and Status Summaries
If you have added a Marathon health check to your service or pod, the Services Health box on the DC/OS dashboard will report the health of your service or pod.
The Services > Services page lists each service or pod, the resources it has requested, and its status. Possible statuses are
Running. If you have set up a Marathon health check, you can also see the health of your service or pod: a green dot for healthy and a red dot for unhealthy. If you have not set up a health check, the dot will be gray.
Figure 1 - DC/OS Services page
To reveal a detailed debugging page, click the name of a service or pod and then the
Debug tab. There, you will see sections for Last Changes, Last Task Failure, Task Statistics, Recent Resource Offers. You will also see a Summary of resource offers and what percentage of those offers matched your pod or service’s requirements, as well as a Details section that lists the host where your service or pod is running and which resource offers were successful and unsuccessful for each deployment. You can use the information on this page to learn where and how you need to modify your service or pod definition.
Figure 2 - Debugging page